package com.swss.util;

import java.io.UnsupportedEncodingException;

public class ChangeCharset {

	public static final String US_ASCII = "US-ASCII";

	public static final String ISO_8859_1 = "ISO-8859-1";

	public static final String UTF_8 = "UTF-8";

	public static final String UTF_16BE = "UTF-16BE";

	public static final String UTF_16LE = "UTF-16LE";

	public static final String UTF_16 = "UTF-16";

	public static final String GBK = "GBK";

	public static final String GB2312 = "GB2312";

	public String toASCII(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, US_ASCII);
	}

	public String toISO_8859_1(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, ISO_8859_1);
	}

	public String toUTF_8(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_8);
	}

	public String toUTF_16BE(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16BE);
	}

	public String toUTF_16LE(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16LE);
	}

	public String toUTF_16(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16);
	}

	public String toGBK(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, GBK);
	}

	public String toGB2312(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, GB2312);
	}

	public String changeCharset(String str, String newCharset)
			throws UnsupportedEncodingException {
		if (str != null) {
			// 用默认字符编码解码字符串。与系统相关，中文windows默认为GB2312
			byte[] bs = str.getBytes();
			return new String(bs, newCharset); // 用新的字符编码生成字符串
		}
		return null;
	}

	public String changeCharset(String str, String oldCharset, String newCharset)
			throws UnsupportedEncodingException {
		if (str != null) {
			// 用源字符编码解码字符串
			byte[] bs = str.getBytes(oldCharset);
			return new String(bs, newCharset);
		}
		return null;
	}
	
	public String translate(String str, String oldCode, String newCode) {
		String tempStr = "";
		try {
			tempStr = new String(str.getBytes(oldCode), newCode);
			tempStr = tempStr.trim();
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
		return tempStr;
	}

	public static void main(String[] args) throws UnsupportedEncodingException {
		ChangeCharset test = new ChangeCharset();
		String str = "This is a 中文的 String!";
		System.out.println("str：" + str);

		String gbk = test.toGBK(str);
		System.out.println("转换成GBK码：" + gbk);
		System.out.println();

		String ascii = test.toASCII(str);
		System.out.println("转换成US-ASCII：" + ascii);
		System.out.println();

		String iso88591 = test.toISO_8859_1(str);
		System.out.println("转换成ISO-8859-1码：" + iso88591);
		System.out.println();

		gbk = test.changeCharset(iso88591, ISO_8859_1, GBK);
		System.out.println("再把ISO-8859-1码的字符串转换成GBK码：" + gbk);
		System.out.println();

		String utf8 = test.toUTF_8(str);
		System.out.println();
		System.out.println("转换成UTF-8码：" + utf8);
		String utf16be = test.toUTF_16BE(str);
		System.out.println("转换成UTF-16BE码：" + utf16be);
		gbk = test.changeCharset(utf16be, UTF_16BE, GBK);
		System.out.println("再把UTF-16BE编码的字符转换成GBK码：" + gbk);
		System.out.println();

		String utf16le = test.toUTF_16LE(str);
		System.out.println("转换成UTF-16LE码：" + utf16le);
		gbk = test.changeCharset(utf16le, UTF_16LE, GBK);
		System.out.println("再把UTF-16LE编码的字符串转换成GBK码：" + gbk);
		System.out.println();

		String utf16 = test.toUTF_16(str);
		System.out.println("转换成UTF-16码：" + utf16);
		String gb2312 = test.changeCharset(utf16, UTF_16, GB2312);
		System.out.println("再把UTF-16编码的字符串转换成GB2312码：" + gb2312);
	}
}